Near Rhymes:
* seventeen fifty-one (the number itself, but with a slight change in pronunciation)
* fifeteen-fifty-one (using a similar number structure)
Eye Rhymes:
* rival (similar spelling, but different pronunciation)
* virile (similar spelling, but different pronunciation)
Other options:
* You could use a word that evokes a similar feeling or idea connected to the number, such as "historic" or "landmark."
* You could use a word that represents the number in another way, like "seventeen hundred and fifty-one."
Ultimately, the best rhyme depends on the context of your writing. Think about what you want to emphasize and choose a rhyme that fits your overall tone.